Can I just pay medical insurance and not social security?

You can only pay medical insurance, not social security. Social insurance is a social and economic system that provides income or compensation for those who lose their ability to work, are temporarily unemployed or suffer losses due to health reasons. The main items of social insurance include endowment insurance, medical insurance, unemployment insurance, industrial injury insurance and maternity insurance.

Legal objectivity:

Social insurance law

Article 27

Individuals who participate in the basic medical insurance for employees will not pay the basic medical insurance premium after retirement and enjoy the basic medical insurance benefits in accordance with the provisions of the state if they reach the statutory retirement age and the accumulated payment has reached the fixed number of years stipulated by the state;

Those who have not reached the fixed number of years prescribed by the state may pay the fees to the fixed number of years prescribed by the state.

Social insurance law

Article 28

Medical expenses that meet the basic medical insurance drug list, diagnosis and treatment items, medical service facilities standards and emergency rescue shall be paid by the basic medical insurance fund in accordance with state regulations.